\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{circuitikz}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes}
\ctikzset{bipoles/length=1cm}
\begin{document}
\small
\begin{circuitikz}[>=latex, scale=1,european]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  \draw (0,0)--(3,0) to [R=$R$] (3,3) ;
  \draw (1.5,3) to [battery2](0,3) to [sV](0,0);
  \ctikzset{diodes/scale=0.6}\draw (1.5,3) to [full diode](3,3) ;
  \node at (0.7,1.5){信号};
\end{circuitikz}
\end{document}